package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.converter.ShoppingCartConverter;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
       //判断当前购物车数据是否存在
        ShoppingCart shoppingCart = ShoppingCartConverter.shoppingCartDTOConvertShoppingCart(shoppingCartDTO);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //存在number属性+1
         if (list != null && list.size() > 0) {
             ShoppingCart cart = list.get(0);
             cart.setNumber(cart.getNumber() + 1);
             shoppingCartMapper.updateNumberById(cart);
         }else {
             //不存在,插入新的数据
             //判断是菜品还是套餐
             Long dishId = shoppingCartDTO.getDishId();
             if(dishId != null) {
                 //添加购物车为菜品
                 Dish dish = dishMapper.getById(dishId);
                 shoppingCart.setName(dish.getName());
                 shoppingCart.setImage(dish.getImage());
                 shoppingCart.setAmount(dish.getPrice());
             }else {
                 //添加购物车为套餐
                 Long setmealId = shoppingCartDTO.getSetmealId();
                 Setmeal setmeal = setmealMapper.getById(setmealId);
                 shoppingCart.setName(setmeal.getName());
                 shoppingCart.setImage(setmeal.getImage());
                 shoppingCart.setAmount(setmeal.getPrice());
             }
             shoppingCart.setNumber(1);
             shoppingCart.setCreateTime(LocalDateTime.now());
             shoppingCartMapper.insert(shoppingCart);
         }

    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        //获得当前用户id
        Long currentId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(currentId).build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        //获得当前用户id
        Long currentId = BaseContext.getCurrentId();
        shoppingCartMapper.delectByUserId(currentId);
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //获取当前的购物车数据
        ShoppingCart shoppingCart = ShoppingCartConverter.shoppingCartDTOConvertShoppingCart(shoppingCartDTO);
         shoppingCart.setUserId(BaseContext.getCurrentId());
         List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

         if (list != null && list.size() > 0) {
             shoppingCart = list.get(0);
              //获取商品的份数
             Integer number = shoppingCart.getNumber();
             if(number == 1){
                 //当前商品在购物车中的份数为1，直接删除当前记录
                 shoppingCartMapper.deleteById(shoppingCart.getId());
             }else {
                 //当前商品在购物车中的份数不为1，减1
                 shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                 shoppingCartMapper.updateNumberById(shoppingCart);
             }
         }
    }

}
